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8 results on '"R. E. Leedy"'

1. Study of acollinear muon pair production ine+e−interactions atEc.m.=29GeV

Author

M. C. Delfino, H. T. Blume, Y. Goldschmidt-Clermont, R. W. Coombes, Alexander Lincoln Read, S. J. Michalowski, M. W. Gettner, R. Prepost, L. J. Rosenberg, G. P. Goderre, H. S. Kaye, O. A. Meyer, E. Fernandez, J. H. Moromisato, T. L. Lavine, M. Piccolo, J. R. Johnson, R. Messner, E. C. Loh, James Allaby, H. L. Lynch, W. W. Ash, Kwong Lau, W. D. Shambroom, Roy Weinstein, J. P. Venuti, R. E. Leedy, H. R. Band, B. K. Heltsley, D. E. Wiser, G. B. Chadwick, L. Baksay, Andrea Carlo Marini, R. W. Zdarko, B. Gottschalk, J. R. Smith, T. Maruyama, R. B. Hurst, S. H. Clearwater, H. Y. Lee, F.J. Ronga, E. von Goeler, D. M. Ritson, D. E. Groom, W. T. Ford, I. M. Peruzzi, and K. Rich

Subjects
Physics, Nuclear physics, Particle physics, Pair production, Particle properties, Muon, Physics::Instrumentation and Detectors, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Physics::Accelerator Physics, High Energy Physics::Experiment, Supersymmetry
Abstract

We have studied the production of acollinear muon pairs in e/sup +/e/sup -/ interactions using the MAC detector at PEP. The results are totally accounted for by the QED processes e/sup +/e/sup -/..-->..e/sup +/e/sup -/..mu../sup +/..mu../sup -/ and e/sup +/e/sup -/..--> mu../sup +/..mu../sup -/..gamma.. in which only the muon pairs are detected. We have also searched for the production of the supersymmetric partners of the muon. The existence of a spin-0 supersymmetric partner of the muon with a mass

Published
1983

2. Precision measurement of the total cross section fore+e−→hadrons at a center-of-mass energy of 29 GeV

Author

E. Fernandez, T. L. Lavine, Alexander Lincoln Read, R. B. Hurst, M. W. Gettner, G. B. Chadwick, B. Gottschalk, J. G. Smith, O. A. Meyer, Tiziano Camporesi, J. P. Venuti, D. E. Wiser, L. J. Moss, R. Prepost, W. W. Ash, Frederic Jean Ronga, Roy Weinstein, H. B. Wald, Hoyun Lee, M. C. Delfino, D. M. Ritson, R. W. Zdarko, H. N. Nelson, J. H. Moromisato, R. Messner, K. Rich, E. von Goeler, Andrea Carlo Marini, D. E. Groom, J. C. Sleeman, W. T. Ford, S. H. Clearwater, R. E. Leedy, L. J. Rosenberg, W. D. Shambroom, K. H. Lau, Brian Heltsley, E. C. Loh, N. Qi, J.R. Johnson, T. Maruyama, M. Piccolo, H. L. Lynch, H. R. Band, S. J. Michalowski, R. W. Coombes, F. Muller, R. de Sangro, H. T. Blume, I. M. Peruzzi, G. P. Goderre, and H. S. Kaye

Subjects
Nuclear physics, Quantum chromodynamics, Physics, Coupling constant, Particle physics, Muon, Annihilation, Pair production, Electron–positron annihilation, Hadron, High Energy Physics::Experiment, Elementary particle
Abstract

We report a high-precision measurement of the ratio R of the total cross section for e/sup +/e/sup -/..-->..hadrons to that for e/sup +/e/sup -/..--> mu../sup +/..mu../sup -/, at a center-of-mass energy of 29.0 GeV using the MAC detector. The result is R = 3.96 +- 0.09. This value of R is used to determine a value of the strong coupling constant ..cap alpha../sub s/ of 0.23 +- 0.06, nearly independent of fragmentation models. Two different analysis methods having quite different event-selection criteria have been used and the results are in agreement. Particular attention has been given to the study of systematic errors. New higher-order QED calculations are used for the luminosity determination and the acceptance for hadrons.

Published
1985

3. Experimental Test of Higher-Order QED and a Search for Excited Muon States

Author

R. Prepost, T. L. Lavine, G. B. Chadwick, S. J. Michalowski, Y. Goldschmidt-Clermont, J. H. Moromisato, Alexander Lincoln Read, M. Piccolo, L. J. Rosenberg, K. Rich, H. Y. Lee, D. M. Ritson, D. E. Wiser, B. K. Heltsley, I. M. Peruzzi, M. C. Delfino, M. W. Gettner, W. D. Shambroom, R. W. Coombes, Roy Weinstein, Andrea Carlo Marini, L. Baksay, O. A. Meyer, R. W. Zdarko, R. Messner, R. E. Leedy, Kwong Lau, G. P. Goderre, H. S. Kaye, E. C. Loh, W. Faissler, T. Maruyama, B. Gottschalk, J. R. Johnson, James Allaby, J. R. Smith, W. W. Ash, H. R. Band, D. E. Groom, W. T. Ford, E. von Goeler, R. B. Hurst, S. H. Clearwater, and F.J. Ronga

Subjects
Physics, Particle physics, Muon, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, media_common.quotation_subject, General Physics and Astronomy, Asymmetry, Spectral line, Nuclear physics, Pair production, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Excited state, High Energy Physics::Experiment, Storage ring, media_common
Abstract

The reactions e/sup +/e/sup -/..--> mu../sup +/..mu../sup -/..gamma gamma.. and e/sup +/e/sup -/..--> mu../sup +/..mu../sup -/..gamma.. have been studied at ..sqrt..s = 29 GeV with the MAC detector at the SLAC storage ring. The measured cross sections, charge asymmetry, and invariant-mass distributions are in good agreement with the predictions of QED theory. Limits are derived for the production of excited muon states.

Published
1983

4. Electroweak Effects ine+e−→μ+μ−at 29 GeV

Author

S. H. Clearwater, I. M. Peruzzi, M. W. Gettner, W. Faissler, R. B. Hurst, E. von Goeler, J. H. Moromisato, D. E. Groom, M. Piccolo, W. T. Ford, T. Maruyama, G. B. Chadwick, Hoyun Lee, B. Gottschalk, S. J. Michalowski, M. C. Delfino, E. C. Loh, B. K. Heltsley, J. R. Smith, L. J. Rosenberg, Andrea Carlo Marini, W. D. Shambroom, G. P. Goderre, H. S. Kaye, H. R. Band, R. Prepost, H. L. Lynch, K. Rich, H. T. Blume, R. W. Coombes, J. R. Johnson, James Allaby, W. W. Ash, F.J. Ronga, D. M. Ritson, Roy Weinstein, E. Fernandez, T. L. Lavine, L. Baksay, R. W. Zdarko, R. Messner, R. E. Leedy, D. E. Wiser, Y. Goldschmidt-Clermont, Alexander Lincoln Read, Kwong Lau, and O. A. Meyer

Subjects
Nuclear physics, Physics, Particle physics, Muon, Annihilation, Pair production, Electron–positron annihilation, Electroweak interaction, General Physics and Astronomy, Elementary particle, Pseudovector, Lepton
Abstract

A measurement of the cross section for production of collinear muon pairs based upon a sample of about 3000 events observed in the MAC detector at the storage ring PEP is presented. From the angular asymmetry A/sub mumu/ = -0.076 +- 0.018 the axial vector weak neutral coupling is found to be given by g/sub A//sup e/g/sub A//sup ..mu../ = 0.31 +- 0.08. .AE

Published
1983

5. Lifetime of Particles ContainingbQuarks

Author

E. Fernandez, W. T. Ford, A. L. Read, J. G. Smith, R. De Sangro, A. Marini, I. Peruzzi, M. Piccolo, F. Ronga, H. T. Blume, H. B. Wald, Roy Weinstein, H. R. Band, M. W. Gettner, G. P. Goderre, B. Gottschalk, R. B. Hurst, O. A. Meyer, J. H. Moromisato, W. D. Shambroom, E. von Goeler, W. W. Ash, G. B. Chadwick, S. H. Clearwater, R. W. Coombes, H. S. Kaye, K. H. Lau, R. E. Leedy, H. L. Lynch, R. L. Messner, S. J. Michalowski, K. Rich, D. M. Ritson, L. J. Rosenberg, D. E. Wiser, R. W. Zdarko, D. E. Groom, Hoyun Lee, E. C. Loh, M. C. Delfino, B. K. Heltsley, J. R. Johnson, T. L. Lavine, T. Maruyama, and R. Prepost

Subjects
Physics, Semileptonic decay, Particle physics, Annihilation, Muon, Meson, High Energy Physics::Phenomenology, Hadron, General Physics and Astronomy, Elementary particle, Nuclear physics, Particle decay, High Energy Physics::Experiment, Nuclear Experiment, Lepton
Abstract

From a sample of hadronic events, produced in e/sup +/e/sup -/ collisions, semileptonic decays of heavy particles have been isolated and used to obtain a measurement for the bottom-quark lifetime of (1.8 +- 0.6(stat.) +- 0.4(syst.)) x 10/sup -12/ sec.

Published
1983

6. A measurement of the forward-backward charge asymmetry at √s=29 GeV

Author

M. W. Gettner, I. M. Peruzzi, R. B. Hurst, J. R. Smith, L. J. Moss, R. de Sangro, F. Muller, R. Prepost, D. M. Ritson, M. C. Delfino, T. Maruyama, R. Messner, M. Piccolo, H. R. Band, R. E. Leedy, Alexander Lincoln Read, G. B. Chadwick, J. P. Venuti, Tiziano Camporesi, L. J. Rosenberg, R. W. Zdarko, J. R. Johnson, D. E. Wiser, H. N. Nelson, G. P. Goderre, N. Qi, T. L. Lavine, J. Pyrlik, Roy Weinstein, D. E. Groom, J. C. Sleeman, W. T. Ford, Piero Giorgio Verdini, and E. von Goeler

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Muon, media_common.quotation_subject, Charge (physics), Forward backward, Asymmetry, Mixing (physics), media_common
Abstract

High p ⊥ inclusive muon events produced in e + e − annihilations at √ s =29 GeV have been analyzed to obtain a measurement of the b b forward-backward charge asymmetry. The result A b =0.034±0.070±0.035 differs from the theoretical expectation (−0.16) unless substantial B 0  B 0 mixing is assumed.

Published
1989

7. The MAC detector

Author

J.V. Allaby, R.M. Morse, J.S. Marsh, H. T. Blume, I. M. Peruzzi, F. Muller, R. Messner, S. Morcos, H. L. Lynch, G. B. Chadwick, Roy Weinstein, H. B. Wald, J. P. Venuti, D. E. Wiser, M. C. Delfino, R. E. Leedy, L.A. Baksay, M. W. Gettner, R. Prepost, W.L. Faissler, O. A. Meyer, Frederic Jean Ronga, Andrea Carlo Marini, L. J. Moss, I. Lippi, M. Bosman, Brian Heltsley, S. J. Michalowski, J. Pyrlik, J. H. Moromisato, Alexander Lincoln Read, Y. Goldschmidt-Clermont, H.Y. Lee, E. Fernandez, Tiziano Camporesi, H. N. Nelson, R. W. Coombes, L. J. Rosenberg, T. L. Lavine, R. de Sangro, R. W. Zdarko, J. G. Smith, B. Gottschalk, W. D. Shambroom, J.R. Johnson, G. P. Goderre, H. S. Kaye, D. M. Ritson, K. Rich, M. Piccolo, H. R. Band, E. C. Loh, S.P. Leung, W. W. Ash, D. E. Groom, J. C. Sleeman, W. T. Ford, N. Qi, S. H. Clearwater, R. B. Hurst, Piero Giorgio Verdini, T. Maruyama, E. von Goeler, and K. H. Lau

Subjects
Physics, Nuclear and High Energy Physics, Muon, Luminosity (scattering theory), Physics::Instrumentation and Detectors, business.industry, Detector, Solid angle, Electron, Particle identification, Nuclear physics, Momentum, Data acquisition, Optics, High Energy Physics::Experiment, business, Instrumentation
Abstract

The MAC detector at PEP recorded data for an integrated luminosity of 335 pb −1 between 1980 and 1986. The design of this low-cost MA gnetic C alorimeter was optimized for electron and muon identification, as well as for the measurement of hadronic energy flow. Muon identification is available over 96% of the solid angle, and MAC was the first detector to make large-scale use of gas-sampling calorimetry. Electromagnetic calorimetry in the central section employs alternating layers of lead and proportional wire chambers (PWCs), and hadron and the remaining electromagnetic calorimetry is accomplished with iron plate and PWC layers. A relatively small central drift chamber in an axial magnetic field provides pattern recognition and modest momentum determination. An outer blanket of drift tubes completes the muon identification system. During the latter two years of operation an innovative “soda straw” vertex chamber made more precise lifetime measurements possible. With an evolving trigger system and highly automated data acquisition system, this modest detector has exceeded most of its designers' expectations and has produced a gratifying spectrum of physics results.

Published
1989

8. Measurement of the polarization ofτleptons produced ine+e−annihilation at√s =29 GeV

Author

Tiziano Camporesi, F. Muller, R. W. Zdarko, R. Prepost, M. Piccolo, J. R. Smith, R. de Sangro, D. M. Ritson, H. N. Nelson, M. W. Gettner, L. J. Rosenberg, Piero Giorgio Verdini, L. J. Moss, R. Messner, Alexander Lincoln Read, G. B. Chadwick, M. C. Delfino, T. Maruyama, J. P. Venuti, E. von Goeler, H. R. Band, J. Pyrlik, N. Qi, G. P. Goderre, D. E. Groom, J. C. Sleeman, W. T. Ford, J. R. Johnson, T. L. Lavine, R. B. Hurst, Roy Weinstein, I. M. Peruzzi, D. E. Wiser, and R. E. Leedy

Subjects
Nuclear physics, Physics, Semileptonic decay, Particle physics, Particle decay, Pair production, Muon, Meson, Electron–positron annihilation, Hadron, High Energy Physics::Experiment, Lepton
Abstract

We present measurements of forward-backward energy asymmetries of tau-lepton decay products from the reaction e/sup +/e/sup -/..-->..tau/sup +/tau/sup -/ in data collected with the MAC detector operating at the SLAC storage ring PEP at a center-of-mass energy of 29 GeV. The energy asymmetries for the decays tau..--> nu../sub tau/enu-bar/sub e/, tau..--> nu../sub tau/..mu..nu-bar/sub ..mu../, tau..--> nu../sub tau/..pi.., and tau..--> nu../sub tau/rho are interpreted as effects caused by the combination of maximally parity-violating weak tau decays and a longitudinal polarization produced by the interference of electromagnetic and weak processes. From the forward-backward polarization asymmetry A/sub P/ = (0.06 +- 0.07) x (1 +- 0.011), we determine the coupling-constant product g/sub a//sup e/g/sub v//sup tau/ = (0.26 +- 0.31) x (1 +- 0.011). Assuming g/sub a//sup e/ = -(1/2 as expected, we find g/sup tau//sub v/ = (-0.52 +- 0.62) x (1 +- 0.011), consistent with the prediction of the Glashow-Weinberg-Salam model of electroweak interactions. Alternatively, assuming the standard-model prediction of negligible polarization in tau-pair production, the leptonic energy spectra are used to measure the Michel parameter to be 0.79 +- 0.10 +- 0.10, consistent with the V-A hypothesis for the taunu-bar/sub tau/-W vertex.

Published
1987

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